97' TJ 4 banger 2.5L 5sp manual, when i turn the key it takes a good 5 seconds to start, even with pumping the gas. Doesn't matter if it's full or at 1/2 tank of gas, has a brand new Maxx battery with 800 cold crank rating, and its mid 40's here right now. I put a bottle of fuel injector cleaner in it a couple days ago and still no help. Any ideas?

when was the last time you replaced the spark plugs? If they are old and/or have not been replaced, then they are not firing properly, giving you the 5 sec lag in starting ( they also may not be gapped to the correct specs). Another could be your starter if you have replaced the plugs recently.

If it starts ok after just a few minutes of not running but won't start if it has been sitting a long time like overnight, replace your fuel pressure regulator. The regulator has a check valve inside that is there to keep the gasoline from draining down out of the fuel rail next to the fuel injectors, to help insure fast starts. The fuel pressure regulator sits on top of the gas tank, on top of the fuel pump assembly. The gas tank has to be dropped to get to it, not a big job at all so long as you wait until the tank is nearly empty before starting the job.

When it leaks, the regulator instead lets all the fuel in the engine drain out and back to the gas tank. The lengthy time to start is how long it is taking the fuel pump to get the fuel back up to the engine from the tank.

Alrighty, just installed new Double Platinum Plugs and some good plug wires, I'll have to see how it does in the morning. As far as I can tell it starts the same. I might be making a trip out to my mechanic soon for other stuff so I will see about the FPR.